气候变化领域集成服务门户(CCPortal): Detection Limits and Near-Field Ground Motions of Fast and Slow Earthquakes

CCPortal

DOI	10.1029/2019JB018935
	Detection Limits and Near-Field Ground Motions of Fast and Slow Earthquakes
	Kwiatek G.; Ben-Zion Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	We investigate theoretical limits to detection of fast and slow seismic events, and spatial variations of ground motion expected from M 6 earthquakes at short epicentral distances. The analyses are based on synthetic velocity seismograms calculated with the discrete wavenumber method assuming seismic velocities and attenuation properties of the crust in Southern California. The examined source properties include different magnitudes (M −1.0 to M 6.0), static stress drops (0.1–10 MPa), and slow and fast ruptures (0.1–0.9 of shear wave velocity). For the M 6 events we also consider variations in rise times producing crack- and pulse-type events and different rupture directivities. Slow events produce ground motion with considerably lower amplitude than corresponding regular fast earthquakes with the same magnitude, and hence are significantly more difficult to detect. The static stress drop and slip rise time also affect the maximum radiated seismic motion, and hence event detectability. Apart from geometrical factors, the saturation and depletion of seismic ground motion at short epicentral distances stem from radiation pattern, earthquake size (magnitude, stress drop), and rupture directivity. The rupture velocity, rise time, and directivity affect significantly the spatial pattern of the ground motions. The results can help optimizing detection of slow and fast small earthquakes and understand the spatial distribution of ground motion generated by large events. ©2020. The Authors.
英文关键词	earthquake detection; ground motions; slow earthquakes; source parameters
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187748
作者单位	Section 4.2: Geomechanics and Scientific Drilling, Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany; Department of Earth Sciences, Institute of Geological Sciences, Free University Berlin, Berlin, Germany; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Kwiatek G.,Ben-Zion Y.. Detection Limits and Near-Field Ground Motions of Fast and Slow Earthquakes[J],2020,125(7).
APA	Kwiatek G.,&Ben-Zion Y..(2020).Detection Limits and Near-Field Ground Motions of Fast and Slow Earthquakes.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Kwiatek G.,et al."Detection Limits and Near-Field Ground Motions of Fast and Slow Earthquakes".Journal of Geophysical Research: Solid Earth 125.7(2020).